# -*- coding: utf-8 -*-
from django.shortcuts import render
from django.views.generic import View
from pure_pagination import Paginator, EmptyPage, PageNotAnInteger
from django.http import HttpResponse
from django.db.models import Q

from .models import Course, CourseResource, Video
from operation.models import UserFavorite, CourseComment, UserCourse
# from utils.mixin_utils import LoginRequiredMixin
from django.contrib.auth.mixins import LoginRequiredMixin


class CourseListView(View):

    def get(self, request):
        all_courses = Course.objects.all().order_by("-add_time")

        hot_courses = Course.objects.all().order_by("-click_nums")[:3]

        # 全局搜索
        keywords = request.GET.get('keywords', '')
        if keywords:
            # icontains搜索时不分区大小写
            all_courses = all_courses.filter(Q(name__icontains=keywords)|Q(desc__icontains=keywords)|Q(detail__icontains=keywords))

        sort = request.GET.get('sort', '')

        if sort:
            if sort == 'students':
                all_courses = all_courses.order_by("-students")
            elif sort == 'hot':
                all_courses = all_courses.order_by("-click_nums")

        try:
            page = request.GET.get('page', 1)
        except PageNotAnInteger:
            page = 1

        p = Paginator(all_courses, 3, request=request)
        courses = p.page(page)

        return render(request, 'course-list.html', {
            'all_courses': courses,
            'sort': sort,
            'hot_courses': hot_courses
        })


class CourseDetailView(View):

    def get(self, request, course_id):
        course = Course.objects.get(id=int(course_id))
        # 增加课程点击数
        course.click_nums += 1
        course.save(0)

        has_fav_course = False
        has_fav_org = False

        if request.user.is_authenticated():
            # 判断用户登录状态
            if UserFavorite.objects.filter(user=request.user, fav_id=course.id, fav_type=1):
                has_fav_course = True
            if UserFavorite.objects.filter(user=request.user, fav_id=course.course_org.id, fav_type=2):
                has_fav_org = True

        tag = course.tag
        if tag:
            relate_courses = Course.objects.filter(tag=tag)[:1]
        else:
            relate_courses = []
        return render(request, 'course-detail.html', {
            'course': course,
            'relate_courses': relate_courses,
            'has_fav_course': has_fav_course,
            'has_fav_org': has_fav_org
        })


class CourseInfoView(LoginRequiredMixin, View):
    """
    课程章节信息
    """
    # login_url = '/login/'     # setting中配置
    def get(self, request, course_id):
        course = Course.objects.get(id=int(course_id))
        course.students += 1
        course.save()

        # 查询用户是否已经关联了该课程
        user_courses = UserCourse.objects.filter(user=request.user, course=course)
        if not user_courses:
            user_courses = UserCourse(user=request.user, course=course)
            user_courses.save()
        # 学过这门课程的所有用户
        user_courses = UserCourse.objects.filter(course=course)
        user_ids = [user_course.user.id for user_course in user_courses]
        all_user_courses = UserCourse.objects.filter(user_id__in=user_ids)
        # 取出所有课程id
        course_ids = [user_course.course.id for user_course in all_user_courses]
        # 获取学过该课程的用户学过其他的所有课程
        relate_courses = Course.objects.filter(id__in=course_ids).order_by("-click_nums")[:3]

        all_resources = CourseResource.objects.filter(course=course)

        return render(request, 'course-video.html', {
            'course': course,
            'course_resources': all_resources,
            'relate_courses': relate_courses
        })


class CommentView(LoginRequiredMixin, View):

    def get(self, request, course_id):
        course = Course.objects.get(id=int(course_id))

        # 查询用户是否已经关联了该课程
        user_courses = UserCourse.objects.filter(user=request.user, course=course)
        if not user_courses:
            user_courses = UserCourse(user=request.user, course=course)
            user_courses.save()
        # 学过这门课程的所有用户
        user_courses = UserCourse.objects.filter(course=course)
        user_ids = [user_course.user.id for user_course in user_courses]
        all_user_courses = UserCourse.objects.filter(user_id__in=user_ids)
        # 取出所有课程id
        course_ids = [user_course.course.id for user_course in all_user_courses]
        # 获取学过该课程的用户学过其他的所有课程
        relate_courses = Course.objects.filter(id__in=course_ids).order_by("-click_nums")[:3]

        all_resources = CourseResource.objects.filter(course=course)
        all_comments = CourseComment.objects.filter(course=course)

        return render(request, "course-comment.html", {
            'course': course,
            'course_resources': all_resources,
            'all_comments': all_comments,
            'relate_courses': relate_courses
        })


class AddCommentsView(View):
    """
    用户添加课程评论
    """
    def post(self, request):
        if not request.user.is_authenticated():
            return HttpResponse('{"status": "fail", "msg": "用户未登陆"}', content_type='application/json')
        course_id = request.POST.get('course_id', 0)
        comments = request.POST.get('comments', '')
        if course_id > 0 and comments:
            course_comments = CourseComment()
            course = Course.objects.get(id=course_id)
            course_comments.course = course
            course_comments.comment = comments
            course_comments.user = request.user
            course_comments.save()
            return HttpResponse('{"status": "success", "msg": "添加成功"}', content_type='application/json')
        else:
            return HttpResponse('{"status": "fail", "msg": "添加失败"}', content_type='application/json')


class VideoPlayView(View):
    """
    视频播放页面
    """

    def get(self, request, video_id):
        video = Video.objects.get(id=int(video_id))
        course = video.lesson.course

        # 查询用户是否已经关联了该课程
        user_courses = UserCourse.objects.filter(user=request.user, course=course)
        if not user_courses:
            user_courses = UserCourse(user=request.user, course=course)
            user_courses.save()
        # 学过这门课程的所有用户
        user_courses = UserCourse.objects.filter(course=course)
        user_ids = [user_course.user.id for user_course in user_courses]
        all_user_courses = UserCourse.objects.filter(user_id__in=user_ids)
        # 取出所有课程id
        course_ids = [user_course.course.id for user_course in all_user_courses]
        # 获取学过该课程的用户学过其他的所有课程
        relate_courses = Course.objects.filter(id__in=course_ids).order_by("-click_nums")[:3]
        all_resources = CourseResource.objects.filter(course=course)

        return render(request, 'course-play.html', {
            'course': course,
            'course_resources': all_resources,
            'relate_courses': relate_courses,
            'video': video
        })
